I just need number 15 pls it is due in 3 hours

Worth 15 points

Step-by-step explanation:

Don't know. Maybe you add up the two numbers then divide the answer.

He is wrong in his approach, because the triangle is a 3,4,5, triangle and he should have put √5^2-4^2

Step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

21/58.

hope to be marked brainliest